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Particle Analyzer for Liquids

#G-555


Development of Automated Granulometric Analyzer of Particles in Liquids

Tech Area / Field

  • INS-MEA/Measuring Instruments/Instrumentation

Status
3 Approved without Funding

Registration date
12.07.2000

Leading Institute
Georgian National Committee of International Society for Optical Engineering (SPIE/GEO), Georgia, Tbilisi

Supporting institutes

  • National Center for Environmental Monitoring, Georgia, Tbilisi

Collaborators

  • Schultz and Associates Limited, USA, AZ, Tucson\nNational and Kapodistrian University of Athens, Greece, Athens

Project summary

One of the most important tasks of providing efficiency, safety, reliability and life time of processes and equipment in ecology, energy, transport, medicine and other sectors is the maintenance of the purity degree for working fluids by granulometric parameters size and suspended particle numerical concentration. These parameters are regulated by international, Russian and CIS standards ISO 4406, GOST 17216-90 "Industrial purity. Fluids purity degrees" for working fluids of hydraulic gear and machines controlling systems, lubricating oils, cutting emulsions, liquid fuels, cleaning solutions, dissolvent; ISO 970 for insulating oils in high-voltage transformers, etc.

The goal of the Project is to investigate and elaborate the methodological and technical base for the new version of the automated granulometric optoelectronic method for testing size and numeric concentration of suspended particles in fluids as well as to work out the relevant analyzer distinguished by advanced characteristics - large ranges of tested sizes and numeric concentration of suspended particles; viscosity and chromaticity of tested working fluids, high accuracy, rapidity and metrological reliability during the large period of industrial exploitation.

The most kindred analogues to the proposed analyzer are instruments produced by companies Pacific Scientific (HIAC/ROYCO Division) USA, models 8000, 8000A, 8000S with modifications 8003, 80011, 8021, 8012, etc.; PMS (USA), models LIL, LPOU; Kratel (Germany), model Partoscope with the transducers SS-3, SM, etc. These instruments have advanced metrology, technical, operating and service characteristics.

The instruments’ exploitation experience showed the necessity in sufficiently frequent calibrations and re-calibrations as well as in correction of sensibility of the whole measuring path (including optic, electronic, hydraulic) that appears when walls of the cuvette are polluted, irradiation sources are changed, optical unit is re-adjusted, etc. The correction of sensitivity of considered analogues often is carried out by electric frame or otherwise, but does not cover entirely the measuring path of instruments. All this limits capabilities of considered instruments.

The most important factor providing efficiency of the granulometric analysis is the metrological reliability and stability, that first of all depends on constancy of sensitivity and on calibration of size channels. For solving the problem the authors of the Project worked out the new automated information correction-calibration system build in the analyzer.

Project's authors have USSR invention certificates on proposed methodology and apparatus and USA, Great Britain, Germany and Poland patents. Investigations results are presented in many publications and thesis for the candidate of sciences degree. Part of thesis are prepared and defended under the scientific guidance of Project's manager.

On the base of fulfilled investigations realized by Projects authors there were worked out different types of particles analyzers AS-110, AS-103, FS-112, FS-151, AOZ-101, FS-104, AOD-101, LFS-101, etc.

The proposed investigation pertains to three technology categories: applied investigations, engineering and demonstration.

It is determined by the fact that the implementation of Project will result in working out methodical and technical base for: the new version of granulometric analysis of different working fluids; for these purposes creation of automated analyzer intended for industrial applications.

Engineering, design, assembling and setup will be carried out by Project executive team while for producing separate units other correspondingly qualified organizations and specialists will be recruited. As a result of the Project there will be built a pilot model of the instrument for carrying out the necessary testing. Testing results will be formalized in conformity with international standards.

As to the demonstration, it is worth mentioning that the commercial potential of the worked instrument consists of: possibility of further utilization of the pilot model for analyzing purity of various industrial fluids on the commercial base; organization of production and commercial realization of instruments; accordance of technical documentation under license to companies for producing the instrument.

The Project fully complies with ISTC goals, namely:

- It will give a possibility to Project’s executive team’ members who were engaged in the sphere of building weapons, particularly mass destruction weapons and its delivery facilities, to reorient their skills toward the civilian activity – investigations and engineering of analyzers for granulometric analysis of working fluids in energy, ecology, aviation transport, and other sectors.

- Will enhance: the Project executive team's members’ integration into the international scientific community.

- Supports applied investigations and the working out of technologies oriented to civilian tasks.

- Project results enhance to solve national and international technical problems.

- The Project underpins the transition toward the market economy.

The work will be carried out in a following sequence.

There will be formalized the task of measurement for testing physical-chemical and optical parameters of dispersive liquid media and polluting these media mechanical admixtures for most typical exploitation fields.

There will be set criteria for building the particles sizes analyser's measurement circuit. Such an analyzer is invariant towards optical constants of the system “particle-dispersive medium” within he wide range of these values’ variation. There also will be defined boundary conditions for a measurement circuit’s functioning with an indication of a tolerance field of measured values’ accuracy characteristics.

It will be studied factors influencing the accuracy of the numeric zone formation, depended on a medium flow rate's gradient, viscosity variation during the analysis of different media, as well as the spread of refraction indexes during the light flow transmission through the media junction boundary "air - glass-dispersive medium".

There will be investigated methodical factors influencing measurements results concerning sizes and numeric concentration.

There will be worked out the imitation model of monodispersive particles for investigating the influence of optical factors on errors occurred in measuring particles sizes; in particular - heterogeneity of lighting of the numeric zone, spread of the magnification factor and aperture of the projection system.

It will be worked out principally new (from the instrumental standpoint) built-in automated system for correcting the sensitivity disturbed due to an influence of non-informative parameters, optical density, optical transmission, optical intensity, lighting device, and sensitivity of optoelectronic registration circuit.

As a result of fulfilled experimental and theoretical investigations there will be worked out the mechanical admixtures analyser's mathematical model used for optimizing methodical-technical decisions on analyzer's design.

After making, assembling and setup will be prepared he pilot model of the mechanic admixtures analyzer. There is foreseen the complex test of analyzer on model as well as on real working media

Obtained results set forth in quarterly progress reports and, in case need, additional information as well will be regularly sent to foreign collaborators.

Their wishes and remarks will be taken into consideration in progress of the project. Their comments evaluating the project progress will be regularly sent to ISTC. This, undoubtedly, will improve the quality of results. Besides, the scientific results will be given to foreign collaborators for using these results in their investigations.

It should be noted that travels of scientists involved in the project to institutions of foreign collaborators will give them the opportunity to acquaint themselves closer with organization of scientific work in the West, to get to know their foreign colleagues better, and joint discussion of corresponding subjects will enrich the both parties with new approaches and ideas.

At the stage of developing the measurements procedures there will be utilized the electromagnetic theory of light dispersion by a single spherical particle, the theory of optical-electronic designing, photometering of weak light signals, hydrodynamics of viscous dispersive media.

Experimental investigations will be carries out using the complex of physical-chemical, optical and spectrophotometric methods and instruments including non-standard methods - microprobe scanning, imitative modeling alongside with creation of optically conjugated registration areas. During carrying out models and algorithms there will be utilized: probability theory and mathematical statistics, mathematical modeling, programming, differential equations theory, optimization theory, computing mathematics. In algorithms' program realization there will used methods for systemic and applied programming. Programs will be written on the turbo-Pascal language for IBM compatible computers.

For testing processes will be widely used methods of optimum experiment's planning, imitative modeling and Monte-Carlo.


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